Core concept
List(1, 2, 3, 4).groupBy(_ % 2) // Map(1 -> List(1, 3), 0 -> List(2, 4))Advertisement
How it works
groupBy materializes fully. Large collections care.
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Trade-offs + gotchas
Data aggregation. Bucketing.
List(1, 2, 3, 4).groupBy(_ % 2) // Map(1 -> List(1, 3), 0 -> List(2, 4))groupBy materializes fully. Large collections care.
Data aggregation. Bucketing.